New high-temperature rated polymer PTCs deliver low resistance

Bourns, Inc has added a new model series to its Multifuse PPTC resettable fuse product line. The new Bourns Multifuse MF-MSHT models are high temperature rated, automotive grade AEC-Q200 compliant and offered in a standard 1812 surface mount package. Additionally, the series provides a low thermal derating factor, a maximum voltage range of 9V-42V, and a hold current range of 200mA-1.75A.

Expanding electronics content in vehicles and connected industrial and consumer IoT-based appliances need more robust overcurrent protection solutions that can maintain higher ambient operating temperatures and reliable, long-life performance. The company created its latest model family to offer effective overcurrent protection with a decreased risk of generating nuisance tripping at elevated temperatures up to 125C in these high-growth applications. Giving further design flexibility, these new high temperature rated PPTCs provide designers with a more extensive selection of overcurrent protection solutions that help them match their application specifications.

"Designers of a variety of automotive-grade applications will find the 125C rating of the MF-MSHT series a robust choice for overcurrent protection that supports their broad temperature requirements", said Lee Bourns, product line manager for Overcurrent Protection at Bourns.

Bourns adds: "The polymer we use in our high-temperature families is advantageous to demanding designs as it offers heightened protection against solvent penetration. Solvents can cause resistance drift in a variety of polymer-based resistive components, including PPTCs. This increase in resistance may, in turn, generate undesirable nuisance tripping by the PPTC because less current is required to trip the device. Our high temperature rated MF-MSHT model family helps address this concern for certain harsh environment system designers."